Do you have 'auth' or 'encrypt' set on your hci0 device? If so, try turning them
off: 'hciconfig hci0 noauth noencrypt'
Failing that, try making your phone forget its pairing with the PC and
recreating the pairing again.

Hm. This works for me with similar phones -- I've used a T68 with FC3, and now
use a T630 with FC4. What happens if you try initiating a connection from the
phone side instead of from the PC? Try sending a file (a picture or something)
from the phone to the PC.
To make that work, you may need to run the gnome-obex-server panel applet, and
re-pair so that the phone knows the obex push service is available.